Hi Christ,
Yes, itemListBox in WDa is not having option for select all/deselect all
Note: There is an event OnLeadSelect which triggers on select of any item on list box but when you set property "multipleSelection" to true the the event will never trigger
If your requirement is to select all and deselect all items in the list box on any button action , you need to process corresponding to that
add 2 new items say : Select all & Deselect all to the context node at index 1 & 2
Example:
Node contains the data as below
1. Select All
2. Deselect All
3. item1
4. item2
5. item3
6. item4
7. item5
When user selects item "Select All" and clicks on display button.
Now get the selected elements from node using method ( IF_WD_CONTEXT_NODE)~GET_SELECTED_ELEMENTS and
If selected item contains "Select all" then consider all items from index 3 onwards for your processing.
When user selects item "Deselect All" , Refresh the node
Regards,
Rama